Article History
Received: 2 June 2020
Accepted: 4 November 2020
First Online: 7 November 2020
Change Date: 27 July 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1007/s10072-021-05464-z
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by the Ethics Committee of Saarland University, application number 16-12 and was registered at the Deutsches Register Klinischer Studien (DRKS), registration number DRKS00012265.